Broken line detection device and method

Abstract

The invention provides a broken line detection device and method. The device comprises a grounding protection line, a connection confirmation line, a vehicle socket, a first detection circuit and a vehicle control device. The first detection circuit is connected between the grounding protection line and the connection confirmation line; the vehicle socket is connected with the vehicle control device through the connection confirmation line; the vehicle control device is connected with the connection confirmation line, and is used for detecting a first voltage at a first connection point where the connection confirmation line is connected with the vehicle control device, and determining whether the connection confirmation line is broken according to the first voltage, so that a vehicle can be prevented from being driven to run in a state of being inserted into a charging connector; personnel injury or property loss is avoided, and the safe driving performance of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted charging, and in particular to a disconnection detection device and method. Background Art

[0002] Today, with the rapid development of the new energy industry, electric vehicles are becoming more and more popular. For the sake of sustainable development, fuel vehicles are slowly withdrawing from the market and electric new energy vehicles will replace them.

[0003] When an electric vehicle is AC charging, the on-board charger (OBC) detects that the charging gun is plugged into the vehicle's socket. At this point, the vehicle enters the READY state, preventing it from being driven while the charging gun is plugged in. However, if the circuit between the vehicle's socket and the on-board charger is disconnected, the OBC may misjudge the plug-in status of the charging gun. This can cause the vehicle to be plugged in, but because the OBC cannot connect to the vehicle's socket, the vehicle will not exit the READY state. This could result in the vehicle being driven while the charging gun is plugged in, potentially posing a risk of harm to life and property. Summary of the Invention

[0004] In view of this, the embodiments of the present invention are dedicated to providing a disconnection detection device and method. By detecting whether the connection confirmation line is broken, it can prevent the vehicle from being driven while the charging connector is plugged in, avoid causing personal injury or property loss, and improve the vehicle's safe driving performance.

[0005] To achieve the above technical objectives, the embodiments of this specification provide the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a disconnection detection device, which includes: a grounding protection line, a connection confirmation line, a vehicle socket, a first detection circuit and a vehicle control device; the first detection circuit is connected between the grounding protection line and the connection confirmation line; the vehicle socket is connected to the vehicle control device through the connection confirmation line; the vehicle control device is connected to the connection confirmation line, and is used to detect a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device, and determine whether the connection confirmation line is disconnected based on the first voltage.

[0007] In this embodiment, by detecting a first voltage at a first connection point where the connection confirmation line CC is connected to the vehicle control device, it can be determined based on the first voltage whether the connection confirmation line CC is broken. When a break in the connection confirmation line CC is detected, the user can be reminded. At this time, the user needs to confirm that the charging connector is not inserted into the vehicle interface before the vehicle enters the READY state. This can prevent the vehicle from being driven with the charging connector inserted, thereby avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0008] Optionally, the first detection circuit includes: a first resistor and a first switch, wherein the first resistor and the first switch are connected in series and connected between the ground protection line and the connection confirmation line.

[0009] In this embodiment, by connecting the first resistor R1, the voltage at the first connection point when the connection confirmation line CC is not disconnected is different from the voltage at the first connection point when the connection confirmation line CC is disconnected. Therefore, it is possible to detect whether the connection confirmation line CC is disconnected, thereby preventing the vehicle from being driven with the charging gun when the line is disconnected, avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0010] Optionally, the first resistor and the first switch are arranged in the vehicle socket, or arranged outside the vehicle socket.

[0011] In this embodiment, .

[0012] Optionally, the vehicle control device includes: a reference power supply, a second resistor and a second switch, one end of the second resistor is connected to the reference power supply, and the other end of the second resistor is connected to the first connection point and the first detection circuit through the second switch.

[0013] In this embodiment, by accessing the reference power supply VCC, the second resistor R2, and the second switch S2, the specific value of the first voltage when the connection confirmation line CC is disconnected or not can be accurately determined, and then according to the different specific values of the first voltage, it can be accurately determined whether the connection confirmation line CC is disconnected or not, thereby preventing the vehicle from being driven with the charging gun when the line is disconnected, avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0014] Optionally, the disconnection detection device further includes a charging plug matching the vehicle socket, the charging plug including a second detection circuit connected between the ground protection line and the connection confirmation line, and the second detection circuit is connected in parallel with the first detection circuit.

[0015] In this embodiment, when the charging plug is inserted into the vehicle socket, the connection confirmation line CC can also be detected based on the first voltage at the first connection point to confirm whether it is broken, thereby preventing the vehicle from being driven with the charging gun when the line is broken, avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0016] Optionally, the second detection circuit includes: a third resistor and a third switch, one end of the third resistor is connected to the first connection point, and the other end of the third resistor is connected to the ground protection line through the third resistor.

[0017] In this embodiment, when the charging connector is inserted into the vehicle socket, if the first voltage of the first connection point is detected to be the reference power supply voltage VCC, it can be confirmed that the connection confirmation line CC is broken; if the first voltage of the first connection point is detected to be VCC*R3 / (R2+R3), it can be determined that the connection confirmation line CC is not broken. By detecting whether the connection confirmation line CC is broken, it is possible to prevent the vehicle from being driven with the charging gun in the event of a break, thereby avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0018] Optionally, the second detection circuit further includes: a fourth resistor, wherein the fourth resistor is connected in parallel across the third switch.

[0019] In this embodiment, the connection status of the vehicle socket can be detected by the third resistor R3, the third switch S3 and the fourth resistor R4.

[0020] In a second aspect, an embodiment of the present application also provides a disconnection detection method, which is applied to the aforementioned disconnection detection device. The disconnection detection method includes: inputting a reference power supply into a first detection circuit, and detecting a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device; and determining whether the connection confirmation line is disconnected based on the first voltage.

[0021] In this embodiment, by inputting a reference power supply into the first detection circuit and detecting a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device, and then determining whether the connection confirmation line is broken based on the first voltage, it is possible to accurately determine whether the connection confirmation line CC is broken. This can prevent the vehicle from being driven while the charging connector is plugged in, which may cause risks of harm to life and property, thereby improving the safe driving performance of the vehicle.

[0022] Optionally, determining whether the connection confirmation line is broken based on the first voltage includes: when the charging plug is not inserted into the vehicle socket, if the first voltage is a reference power supply voltage, determining that the connection confirmation line is broken; if the first voltage is VCC*R1 / (R1+R2), determining that the connection confirmation line is not broken, wherein VCC is the reference power supply voltage, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

[0023] In this embodiment, when the charging plug is not inserted into the vehicle socket, the different first voltages at the detected first connection point can be used to determine whether the connection confirmation line CC is disconnected. This can prevent the vehicle from being driven with the charging gun in the event of a disconnection, thereby avoiding personal injury or property loss and improving the vehicle's safe driving performance.

[0024] Optionally, determining whether the connection confirmation line is broken based on the first voltage includes: controlling the first switch to close when the charging plug is inserted into the vehicle socket; if the first voltage is a reference power supply voltage, determining that the connection confirmation line is broken; if the first voltage is VCC*R3 / (R2+R3), determining that the connection confirmation line is not broken, wherein R3 is the resistance value of the third resistor.

[0025] In this embodiment, when the charging connector is inserted into the vehicle socket, the disconnection detection of the connection confirmation line CC can prevent the vehicle from being driven with the charging gun when the line is disconnected, avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0026] It can be seen from the above technical solution that the disconnection detection device provided in the embodiment of this specification includes: a grounding protection line, a connection confirmation line, a vehicle socket, a first detection circuit and a vehicle control device; the first detection circuit is connected between the grounding protection line and the connection confirmation line; the vehicle socket is connected to the vehicle control device through the connection confirmation line; the vehicle control device is connected to the connection confirmation line, and is used to detect the first voltage at the first connection point where the connection confirmation line is connected to the vehicle control device, and determine whether the connection confirmation line is disconnected based on the first voltage, which can prevent the vehicle from being driven when the charging connector is plugged in, avoid personal injury or property loss, and improve the vehicle's safe driving performance.

[0027] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 FIG2 is a schematic structural diagram of a line break detection device provided in an embodiment of the present application;

[0030] Figure 2 FIG2 is a schematic diagram of an equivalent circuit of a device for detecting a disconnection when a charging plug is not inserted, provided by one embodiment of the present application;

[0031] Figure 3FIG2 is a schematic diagram of an equivalent circuit of a device for detecting a disconnection when a charging plug is inserted, provided by one embodiment of the present application;

[0032] Figure 4 Shown is a schematic diagram of the matching connection between a charging plug and a vehicle socket provided by one embodiment of the present application;

[0033] Figure 5 Shown is a schematic diagram of the matching connection between a charging plug and a vehicle socket provided by another embodiment of the present application;

[0034] Figure 6 FIG2 is a flow chart of a disconnection detection method provided in one embodiment of the present application. DETAILED DESCRIPTION

[0035] Unless otherwise defined, technical or scientific terms used in the embodiments of this specification should have the same ordinary meaning as those understood by persons of ordinary skill in the art to which this specification pertains. The terms "first," "second," and similar terms used in the embodiments of this specification do not denote any order, quantity, or importance, but are provided solely to avoid confusion between constituent elements.

[0036] Unless the context requires otherwise, throughout this specification, the term "plurality" means "at least two," and "including" is to be interpreted as open and inclusive, meaning "including, but not limited to." Throughout this specification, the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of this specification. The schematic representations of these terms do not necessarily refer to the same embodiment or example.

[0037] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0038] In related technology, during AC charging, the on-board charger (OBC) determines whether a charging gun is plugged into the vehicle's AC charging port by detecting the resistance between the connection confirmation wire (CC) and the ground protection wire (PE), or the voltage signal at the CP port. When a charging gun is plugged into the charging socket, the vehicle enters the READY state, preventing the vehicle from driving while the charging gun is plugged in.

[0039] If the wiring harness between the charging socket and OBC is broken, or the docking plug is loose, and the OBC cannot correctly connect to the CC resistance and CP power signals, the OBC will misjudge the insertion status of the charging gun, causing the actual vehicle to be plugged into the charging gun. However, since the OBC cannot connect to the CC resistance and CP signals of the charging gun, the vehicle does not exit the READY state. There is a risk that the vehicle may be driven with the charging gun plugged in, which may cause harm to life and property.

[0040] Based on this, the present application provides a disconnection detection device, such as Figure 1 As shown, the disconnection detection device includes: a ground protection line PE, a connection confirmation line CC, a vehicle socket, a first detection circuit, and a vehicle control device. The first detection circuit is connected between the ground protection line PE and the connection confirmation line CC; the vehicle socket is connected to the vehicle control device via the connection confirmation line CC; the vehicle control device is connected to the connection confirmation line CC, and is configured to detect a first voltage at a first connection point between the connection confirmation line CC and the vehicle control device, and determine whether the connection confirmation line CC is disconnected based on the first voltage.

[0041] The vehicle control device can be set in the on-board charger, that is, it can be integrated with the on-board charger. The vehicle control device can also be set outside the on-board charger, but is communicatively connected to the on-board charger. The ground protection line (ProtectiveEarthing, PE) is connected to the device ground GND. The connection confirmation line CC is a signal line used to confirm whether the physical connection between the charging plug and the vehicle socket is reliable. Its core function is to detect the connection status through changes in resistance value. The charging plug is a plug in the charging device that matches the vehicle socket when the charging device charges the vehicle. For example, the charging plug can be a charging gun. The first connection point can be any point on the connection confirmation line CC, located between the vehicle socket and the vehicle control device. This application does not limit the specific position of the first connection point.

[0042] The disconnection detection device of the embodiment of the present application provides a first detection circuit between the ground protection line PE and the connection confirmation line CC. The vehicle control device powers up the first detection circuit and detects a first voltage at a first connection point between the connection confirmation line CC and the vehicle control device. Based on the first voltage, it can be determined whether the connection confirmation line CC is disconnected. When a disconnection of the connection confirmation line CC is detected, the user can be alerted. At this time, the user needs to confirm that the charging connector is not inserted into the vehicle interface before the vehicle enters the READY state. This prevents the vehicle from being driven while the charging connector is inserted, which may pose a risk to life and property, thereby improving the vehicle's safe driving performance.

[0043] In order to more clearly illustrate the technical solution provided by the embodiments of the present application, a line break detection device provided by the present application is further described below.

[0044] Considering that the voltage of the first connection point needs to be detected, and the resistor can generally play the role of voltage division, it is possible to consider forming different loops by the first detection circuit when the connection confirmation line CC is disconnected and disconnected so that the voltage of the first connection point is different for identification. Based on this, optionally, as Figure 2 As shown, the first detection circuit includes: a first resistor R1 and a first switch S1, the first resistor R1 and the first switch S1 are connected in series and connected between the ground protection line and the connection confirmation line. When performing the connection confirmation line CC disconnection detection, the vehicle control device powers on the first detection circuit. If the connection confirmation line CC is disconnected, the first detection circuit is disconnected from the vehicle control device, and the first resistor does not participate in the voltage division. If the connection confirmation line CC is not disconnected, the first detection circuit is connected to the vehicle control device, and the first resistor R1 participates in the voltage division. In this way, by connecting the first resistor R1, the voltage at the first connection point when the connection confirmation line CC is not disconnected is different from the voltage at the first connection point when the connection confirmation line CC is disconnected, so that it can be detected whether the connection confirmation line CC is disconnected, and then it can be prevented from driving the vehicle with the charging gun in the case of a disconnection, avoiding personal injury or property loss, and improving the safe driving performance of the vehicle.

[0045] Considering that the voltage of the first connection point can be detected only when power is supplied to the first detection circuit, based on this, optionally, continue to refer to Figure 2The vehicle control device includes: a reference power supply VCC, a second resistor R2, and a second switch S2. One end of the second resistor R2 is connected to the reference power supply, and the other end of the second resistor R2 is connected to the first connection point and the first detection circuit via the second switch S2. The second switch S2 is a semiconductor switch, such as a bipolar transistor switch, a PMOS transistor, or an NMOS transistor. "×" indicates that the connection confirmation line CC may be disconnected, and detection point 3 represents the first connection point. When detecting whether the connection confirmation line is disconnected, the second switch S2 is controlled to close. If the connection confirmation line CC is disconnected, the first resistor R1 and the first switch S1 are disconnected from the circuit, and the first voltage at the first connection point is the reference power supply voltage VCC. If the connection confirmation line CC is not disconnected, the first switch S1 is closed, connecting the first resistor R1 and the first switch S1 to the circuit, and the first voltage at the first connection point is VCC*R1 / (R1+R2), where VCC is the reference power supply voltage, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor. It can be seen that the first voltage of the first connection point detected is different when the connection confirmation line CC is broken and when it is not broken, so it can be confirmed whether the connection confirmation line CC is broken based on the first voltage of the first connection point detected. Specifically, if the first voltage of the first connection point is detected to be the reference power supply voltage VCC, it can be confirmed that the connection confirmation line CC is broken. If the first voltage of the first connection point is detected to be VCC*R1 / (R1+R2), it can be determined that the connection confirmation line CC is not broken. In this way, with reference to the access of the power supply VCC, the second resistor R2 and the second switch S2, the specific value of the first voltage when the connection confirmation line CC is disconnected or not can be accurately determined, and then according to the different specific values of the first voltage, it can be accurately determined whether the connection confirmation line CC is disconnected or not, thereby preventing the vehicle from being driven with the charging gun when it is broken, avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0046] It should be noted that the above detection does not involve the charging connector, meaning that the charging connector is not plugged into the vehicle socket at this time. When the charging connector is not plugged into the vehicle socket, disconnection detection of the connection confirmation cable CC can prevent the vehicle from being driven with the charging gun in the event of a disconnection, thereby preventing personal injury or property damage and improving vehicle safety. If a disconnection of the connection confirmation cable CC is detected, a prompt message can be sent to the user to remind them, ensuring that the user's needs are met to the greatest extent possible while ensuring vehicle safety.

[0047] If the charging connector is plugged into the vehicle socket, it will inevitably affect the first voltage at the first connection point. Based on this, in an embodiment of the present application, the disconnection detection device also includes a charging plug that matches the vehicle socket. The charging plug includes a second detection circuit connected between the ground protection line and the connection confirmation line, and the second detection circuit is connected in parallel with the first detection circuit. In this way, when the charging connector is plugged into the vehicle socket, after the vehicle control device powers on the first detection device, the first voltage at the first connection point is related to both the first detection circuit and the second detection circuit. If the connection confirmation line CC is disconnected, the first detection circuit and the second detection circuit are disconnected from the vehicle control device, and the first detection circuit and the second detection circuit are not connected. At this time, the first voltage at the first connection point is the reference power supply voltage VCC. If the connection confirmation line CC is not disconnected, the first detection circuit and the second detection circuit are connected to the vehicle control device at the same time. The first voltage at the first connection point is related to the resistance of the first detection circuit and the second detection circuit in parallel, and is inevitably less than the reference power supply voltage VCC. It can be seen that when the charging plug is inserted into the vehicle socket, the disconnection detection device of the embodiment of the present application can also detect whether the connection confirmation line CC is disconnected based on the first voltage at the first connection point, thereby preventing the vehicle from being driven with the charging gun when the line is disconnected, avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0048] In order to accurately detect whether the connection confirmation line CC is disconnected when the charging connector is inserted into the vehicle socket, in the embodiment of the present application, Figure 3 As shown, the second detection circuit includes a third resistor R3 and a third switch S3. One end of the third resistor R3 is connected to the first connection point, and the other end of the third resistor R3 is connected to the ground protection line PE through the third switch S3. When the charging plug is connected to the vehicle socket, the button corresponding to the first switch S1 on the vehicle socket is controlled not to be pressed, that is, the first switch S1 is opened, and the first detection circuit is disconnected from the vehicle control device. At this time, the third switch S3 can be controlled to close. If the connection confirmation line CC is disconnected, the second detection circuit is also disconnected from the vehicle control device, and the first voltage at the first connection point is the reference power supply voltage VCC. If the connection confirmation line CC is not disconnected, the third resistor R3 and the third switch S3 are properly connected to the vehicle control device. The second resistor R2, the second switch S2, the third resistor R3, and the third switch S3 form a loop. The second resistor R2 and the third resistor R3 divide the voltage. The first voltage at the first connection point is VCC*R3 / (R2+R3), where R3 is the resistance value of the third resistor.

[0049] It can be seen that when the charging connector is inserted into the vehicle socket, the first voltage of the first connection point detected is different when the connection confirmation line CC is broken and when it is not broken. Therefore, it is possible to confirm whether the connection confirmation line CC is broken based on the first voltage detected at the first connection point. Specifically, if the first voltage of the first connection point is detected to be the reference power supply voltage VCC, it can be confirmed that the connection confirmation line CC is broken. If the first voltage of the first connection point is detected to be VCC*R3 / (R2+R3), it can be determined that the connection confirmation line CC is not broken. When the charging connector is inserted into the vehicle socket, by detecting whether the connection confirmation line CC is broken, it is possible to prevent the vehicle from being driven with the charging gun when the line is broken, thereby avoiding personal injury or property loss, and improving the vehicle's safe driving performance.

[0050] When the charging connector is inserted into the vehicle socket, if it is detected that the connection confirmation line CC is disconnected, the on-board charger can remind the user that the vehicle socket connection confirmation line CC is disconnected, such as through a text reminder via IP / HUT, and ask the user to confirm whether the vehicle socket has a charging plug inserted. If it can be ignored, the user is asked to confirm on the HUT. If the user does not confirm to ignore on the HUT, the vehicle is prohibited from entering the READY state. Only when the user confirms to ignore on the HUT can the vehicle be used normally and enter the READY state. The HUT is a head-up display system, and the IP can be an IP device that communicates with the on-board charger, etc. In this way, when there is a connection failure in the vehicle socket, the user is prompted to confirm whether the charging plug is connected. After the user chooses to ignore on the HUT, the vehicle can also be used normally. This can meet the user's car needs to the greatest extent while ensuring the safety of the car.

[0051] In the embodiment of the present application, the specific connection between the charging plug and the vehicle socket is shown in FIG. Figure 4 When the power supply device is charging an electric vehicle, the charging plug in the power supply device is plugged into the vehicle socket in the electric vehicle, and the two are mated and connected. At this point, the power supply device's power lines L1, L2, L3, and ground line N are connected to the power lines L1, L2, L3, and ground line N in the electric vehicle, respectively. The power supply device's ground protection line PE, connection confirmation line CC, and control signal line CP are connected to the ground protection line PE, connection confirmation line CC, and control signal line CP in the vehicle socket, respectively.

[0052] The power supply control device includes a first output terminal, a second output terminal, and a voltage detection terminal. The first output terminal is a 12V voltage output terminal, and the second output terminal is a PWM signal output terminal. The power supply device also includes a control switch S0 and a current-limiting resistor R0. The control switch S0 is a single-pole double-throw switch with a moving terminal and a fixed terminal. The moving terminal of the control switch S0 is connected to the power supply control device, that is, to the first output terminal or the second output terminal, and the fixed terminal of the control switch S0 is connected to the current-limiting resistor R0. The voltage detection terminal is connected to the end of the current-limiting resistor R0 that is away from the power supply control device.

[0053] When the charging plug is not connected to the vehicle socket, the active end of the control switch S0 is switched to the first output end. When the charging plug is connected to the vehicle socket and charging the electric vehicle, the active end of the control switch S0 is switched to the second output end, and the power supply control device outputs a PWM signal to the charging plug. The PWM signal can be used to adjust the voltage, current, power, etc. during charging.

[0054] It is understandable that when the charging plug is matched and connected to the vehicle socket, the active end of the control switch S0 can also be placed at the first output end to provide a 12V voltage. At this time, the voltage at the detection point 2 can be detected.

[0055] In the embodiment of the present application, the electric vehicle further includes a diode D1, a fifth resistor R5, a fifth switch S5, and a sixth resistor R6. The anode of the diode D1 is connected to the end of the current-limiting resistor R0 that is remote from the control switch S0. The cathode of the diode D1 is connected to the ground protection line PE via the sixth resistor R6. The cathode of the diode D1 is also connected to the on-board charger via the fifth resistor R5 and the fifth switch S5 connected in series.

[0056] In this embodiment of the present application, the second detection circuit further includes a fourth resistor R4 connected in parallel across the third switch S3. When the third switch S3 is closed, the fourth resistor R4 is connected in series with the third resistor R3. When the third switch S3 is open, the fourth resistor R4 is short-circuited. The third resistor R3, the third switch S3, and the fourth resistor R4 can be used to detect the connection status of the vehicle socket.

[0057] The vehicle control unit determines whether the connection confirmation line CC between the vehicle socket and the vehicle control unit is broken by measuring the resistance between detection point 3 and the protective ground line PE. If the connection confirmation line CC is not broken, the rated capacity of the current charging connection device (cable) (CC signal) is determined based on the resistance between detection point 3 and the protective ground line PE. Simultaneously, the PWM signal duty cycle at detection point 2 is used to determine the supply current of the power supply device (CP signal).

[0058] When confirming that the charging connector is fully connected, the vehicle control device determines whether the vehicle socket is fully connected by measuring the resistance between detection point 3 and the protective ground line PE. When the vehicle socket is not connected, the third switch S3 is closed, the connection confirmation line CC is not connected, and the resistance between detection point 3 and the protective ground line PE is infinite. When the vehicle socket is partially connected, the second switch S3 is open, the connection confirmation line CC is connected, and the resistance between detection point 3 and the protective ground line PE is R3+R4. When the vehicle socket is fully connected, the third switch S3 is closed, the connection confirmation line CC is connected, and the resistance between detection point 3 and the protective ground line PE is R3.

[0059] To confirm that the charging device is fully connected, if the power supply device is fault-free, switch S0 is controlled to switch from the 12V connection state to the PWM state, and the power supply control device issues a PWM signal. The power supply control device determines whether the charging connection device is fully connected by measuring the voltage value at the detection point or detection point 1. The vehicle control device determines whether the charging device is fully connected by measuring the PWM signal at detection point 2.

[0060] When it is confirmed that the connection confirmation line CC is not disconnected, the vehicle socket is fully connected, and the charging device is fully connected, the switch K1 and the switch K2 can be controlled to be closed, and the power supply device provides AC power to the on-board charger to charge the electric vehicle.

[0061] In the embodiments of this application, Figure 4 As shown, the first resistor R1 and the first switch S1 can be set in the vehicle socket. The first resistor R1 and the first switch S1 are set inside the vehicle socket, which can simplify the structure, reduce the volume of the disconnection detection device, and reduce the cost. Or, as Figure 5 As shown, the first resistor R1 and the first switch S1 can also be arranged outside the vehicle socket. The first resistor R1 and the first switch S1 are arranged outside the vehicle socket and are located before the plug-in of the on-board charger (OBC). The specific positions of the first resistor R1 and the first switch S1 can be set as needed. In addition, the switch form of the first switch S1 can be selected as needed, such as a mechanical switch such as a button switch or a sliding switch, or a semiconductor switch. The resistance value of the first resistor R1 can also be set as needed. In this way, the flexibility of the disconnection detection device can be increased to more accurately detect whether the connection confirmation line CC is disconnected, thereby preventing the vehicle from being driven with the charging gun in the event of a disconnection, thereby avoiding personal injury or property loss.

[0062] The disconnection detection device of an embodiment of the present application includes: a grounding protection line, a connection confirmation line, a vehicle socket, a first detection circuit and a vehicle control device; the first detection circuit is connected between the grounding protection line and the connection confirmation line; the vehicle socket is connected to the vehicle control device through the connection confirmation line; the vehicle control device is connected to the connection confirmation line, and is used to detect a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device, and determine whether the connection confirmation line is disconnected based on the first voltage, which can prevent the vehicle from being driven when the charging connector is plugged in, avoid personal injury or property loss, and improve the vehicle's safe driving performance.

[0063] In an exemplary embodiment of the present specification, a disconnection detection method is also provided, which is applied to the aforementioned disconnection detection device. The disconnection detection device includes: a ground protection line, a connection confirmation line, a vehicle socket, a first detection circuit, and a vehicle control device; the first detection circuit is connected between the ground protection line and the connection confirmation line; the vehicle socket is connected to the vehicle control device via the connection confirmation line; the vehicle control device is connected to the connection confirmation line, and is configured to detect a first voltage at a first connection point between the connection confirmation line and the vehicle control device, and determine whether the connection confirmation line is disconnected based on the first voltage.

[0064] like Figure 6 As shown, the disconnection detection method includes:

[0065] Step S11: inputting a reference power supply into the first detection circuit, and detecting a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device.

[0066] To detect a disconnection in the connection confirmation line CC, the vehicle control device powers up the first detection circuit, inputting a reference power supply VCC into the first detection circuit. Based on the operation of the first detection circuit, the first voltage at the first connection point between the connection confirmation line CC and the vehicle control device is detected. It should be noted that the same test is performed whether the charging plug is inserted or not inserted into the vehicle socket.

[0067] Step S12: determining whether the connection confirmation line is disconnected according to the first voltage.

[0068] When the charging plug is not inserted into the vehicle socket, the first voltage at the first connection point is different when the connection confirmation line CC is disconnected and when it is not disconnected. Similarly, when the charging plug is inserted into the vehicle socket, the first voltage at the first connection point is also different when the connection confirmation line CC is disconnected and when it is not disconnected. Therefore, whether the connection confirmation line CC is disconnected can be determined based on the detected first voltage.

[0069] In the embodiment of the present application, a reference power supply is input to the first detection circuit, and a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device is detected. Furthermore, based on the first voltage, whether the connection confirmation line is broken is determined. This allows for accurate determination of whether the connection confirmation line CC is broken. This prevents the vehicle from being driven while the charging connector is plugged in, which could pose a risk of harm to life and property, thereby improving vehicle safety.

[0070] In the embodiment of the present application, when the charging plug is not inserted into the vehicle socket and when the charging plug is inserted into the vehicle socket, the access conditions of the first detection circuit and the second detection circuit are different, which are explained below respectively.

[0071] When the charging plug is not inserted into the vehicle socket, the second detection circuit in the charging plug is disconnected from the detection device. In this case, only the first voltage at the first connection point is detected based on the connection between the first detection circuit and the vehicle control device. If the connection confirmation line CC is disconnected, the first resistor R1 and the first switch S1 are disconnected from the circuit, and the first voltage at the first connection point is the reference power supply voltage VCC. If the connection confirmation line CC is intact, the button corresponding to the first switch S1 is pressed, closing the first switch S1 and connecting the first resistor R1 and the first switch S1 to the circuit. The first voltage at the first connection point is VCC*R1 / (R1+R2), where VCC is the reference power supply voltage, R1 is the resistance of the first resistor, and R2 is the resistance of the second resistor. Optionally, when the charging plug is not inserted into the vehicle socket, if the first voltage is the reference power supply voltage, the connection confirmation line is determined to be disconnected; if the first voltage is VCC*R1 / (R1+R2), the connection confirmation line is determined to be intact, where VCC is the reference power supply voltage, R1 is the resistance of the first resistor, and R2 is the resistance of the second resistor. If a disconnection in the connection confirmation cable CC is detected, repair of the cable CC can be considered, or charging of the vehicle can be temporarily discontinued. When the charging plug is not inserted into the vehicle socket, the difference in the first voltage detected at the first connection point can be used to determine whether the connection confirmation cable CC is disconnected. This prevents driving the vehicle with the charging plug connected in the event of a disconnection, preventing personal injury or property damage, and improving vehicle safety.

[0072] When the charging plug is inserted into a vehicle socket, if the connection confirmation line CC is disconnected and the button corresponding to the first switch S1 is not pressed, the first switch S1 is disconnected, and the first detection circuit is disconnected from the vehicle control device. The second detection circuit is also disconnected from the vehicle control device, and the first voltage at the first connection point is the reference power supply voltage VCC. If the connection confirmation line CC is not disconnected, the first and second detection circuits are simultaneously connected to the vehicle control device, the third resistor R3 and the third switch S3 are properly connected to the vehicle control device, and the second resistor R2, the second switch S2, the third resistor R3, and the third switch S3 form a loop. The second resistor R2 and the third resistor R3 divide the voltage, and the first voltage at the first connection point is VCC*R3 / (R2+R3), where R3 is the resistance value of the third resistor. Based on this, optionally, when the charging plug is inserted into the vehicle socket, the first switch is controlled to close; if the first voltage is the reference power supply voltage, the connection confirmation line is determined to be disconnected; if the first voltage is VCC*R3 / (R2+R3), the connection confirmation line is determined to be intact, where R3 is the resistance value of the third resistor. When the charging connector is inserted into the vehicle socket, the disconnection detection of the connection confirmation line CC can prevent the vehicle from being driven with the charging gun in the event of a disconnection, avoiding personal injury or property damage, and improving the vehicle's safe driving performance.

[0073] When the charging plug is inserted into the vehicle socket, if it is detected that the connection confirmation line CC is disconnected, the user can be reminded that the vehicle socket connection confirmation line CC is disconnected, such as through a text reminder via IP / HUT, and the user is asked to confirm whether the vehicle socket has a charging plug inserted. If it can be ignored, the user is asked to confirm on the HUT. If the user does not confirm to ignore on the HUT, the vehicle is prohibited from entering the READY state. Only when the user confirms to ignore on the HUT can the vehicle be used normally and enter the READY state. The HUT is a head-up display system, and the IP can be an IP device that communicates with the on-board charger, etc. In this way, when there is a connection failure in the vehicle socket, the user is prompted to confirm whether the charging plug is connected. After the user chooses to ignore on the HUT, the vehicle can also be used normally. This can meet the user's car needs to the greatest extent while ensuring the safety of the car.

[0074] In a specific embodiment, the first detection circuit includes: a first resistor and a first switch, wherein the first resistor and the first switch are connected in series and connected between the ground protection line and the connection confirmation line.

[0075] In some embodiments, the first resistor and the first switch are disposed in the vehicle socket, or are disposed outside the vehicle socket.

[0076] In some embodiments, the vehicle control device includes: a reference power supply, a second resistor and a second switch, one end of the second resistor is connected to the reference power supply, and the other end of the second resistor is connected to the first connection point and the first detection circuit through the second switch.

[0077] In some embodiments, the disconnection detection device further includes a charging plug that matches the vehicle socket, the charging plug includes a second detection circuit connected between the ground protection line and the connection confirmation line, and the second detection circuit is connected in parallel with the first detection circuit.

[0078] In some embodiments, the second detection circuit includes: a third resistor and a third switch, one end of the third resistor is connected to the first connection point, and the other end of the third resistor is connected to the ground protection line through the third resistor.

[0079] In some embodiments, the second detection circuit further includes: a fourth resistor, wherein the fourth resistor is connected in parallel across the third switch.

[0080] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0081] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0082] In the description of the present disclosure, it should be understood that if the terms "up", "down", "front", "back", "left" and "right" are used to indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present disclosure.

[0083] It should be noted that, in the embodiments of the present application, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. It should also be noted that the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, commodity or device comprising the elements.

[0084] The above are merely examples of the present disclosure and are not intended to limit the present disclosure. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure are intended to be included within the scope of the claims of the present disclosure.

Claims

1. A wire break detection device, characterized in that: The device includes: a ground protection line, a connection confirmation line, a vehicle socket, a first detection circuit and a vehicle control device; The first detection circuit is connected between the ground protection line and the connection confirmation line; the vehicle socket is connected to the vehicle control device via the connection confirmation line; The vehicle control device is connected to the connection confirmation line and is used to detect a first voltage at a first connection point where the connection confirmation line and the vehicle control device are connected, and determine whether the connection confirmation line is broken according to the first voltage.

2. The wire breakage detection device according to claim 1, wherein: The first detection circuit includes: a first resistor and a first switch, wherein the first resistor and the first switch are connected in series and connected between the ground protection line and the connection confirmation line.

3. The wire breakage detection device according to claim 2, wherein: The first resistor and the first switch are arranged in the vehicle socket, or arranged outside the vehicle socket.

4. The wire breakage detection device according to claim 1, wherein: The vehicle control device includes: a reference power supply, a second resistor and a second switch, one end of the second resistor is connected to the reference power supply, and the other end of the second resistor is connected to the first connection point and the first detection circuit through the second switch.

5. The wire breakage detection device according to claim 1, wherein: The disconnection detection device further includes a charging plug matched with the vehicle socket, the charging plug includes a second detection circuit connected between the ground protection line and the connection confirmation line, and the second detection circuit is connected in parallel with the first detection circuit.

6. The wire breakage detection device according to claim 5, characterized in that: The second detection circuit includes: a third resistor and a third switch, one end of the third resistor is connected to the first connection point, and the other end of the third resistor is connected to the ground protection line through the third resistor.

7. The wire breakage detection device according to claim 6, wherein: The second detection circuit further includes: a fourth resistor, and the fourth resistor is connected in parallel across the third switch.

8. A disconnection detection method, characterized in that: The wire breakage detection device according to any one of claims 1 to 7, wherein the wire breakage detection method comprises: Inputting a reference power supply to the first detection circuit and detecting a first voltage at a first connection point where the connection confirmation line is connected to the vehicle control device; It is determined whether the connection confirmation line is disconnected according to the first voltage.

9. The method according to claim 8, characterized in that The determining, based on the first voltage, whether the connection confirmation line is disconnected includes: When the charging plug is not inserted into the vehicle socket, if the first voltage is a reference power supply voltage, determining that the connection confirmation line is disconnected; If the first voltage is VCC*R1 / (R1+R2), it is determined that the connection confirmation line is not broken, wherein VCC is the reference power supply voltage, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

10. The method according to claim 9, characterized in that The determining, based on the first voltage, whether the connection confirmation line is disconnected includes: When the charging plug is inserted into the vehicle socket, the first switch is controlled to close; If the first voltage is a reference power supply voltage, determining that the connection confirmation line is disconnected; If the first voltage is VCC*R3 / (R2+R3), it is determined that the connection confirmation line is not broken, where R3 is the resistance value of the third resistor.

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